Michael Morrow was an acute reader of medieval literature, and one who knew that every medieval text is a potential source of information for the modern performer and musicologist. A striking example is provided by the 453 chapters of a fifteenth-century anthology now in the library of Sidney Sussex College, Cambridge. This imposing book appears to be one of the largest collections of Marian miracle-stories in the world. Assembled in the year 1409, perhaps in East Anglia, it contains forty-nine chapters about Marian devotions, liturgies, plainsongs and prayers, among them several texts that were set by English composers: Salve regina (there are ten chapters devoted to this chant alone), Alma redemptoris mater, Gaude flore virginali, Sancta Maria non est tibi similis, Salve sancta parens, Gaude Maria virgo, Ave maris Stella and Gaude virgo mater Christi.